Q: I recently rented a car from Avis in Houston with a friend. A few weeks after we returned the car, I discovered a $260 charge for optional insurance that we never asked for. I need your help getting a refund.

Q: I rented a car through Auto Europe. During my rental, the car didn't work properly. The vehicle wouldn't move when I pressed on the accelerator, and it felt dangerous to drive. I called the company from my hotel and asked for another car.